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| author |   Uros Bizjak <ubizjak@gmail.com> | 2018-10-11 19:40:45 +0200 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2018-10-17 00:30:09 +0200 |
| commit | 44c2d667ce3fa6933ac30a726f148f0c6d84ce5f (patch) | |
| tree | 5c76c54f6a55dba4bcb4181c747423e5b14c73b6 /arch/x86/kvm | |
| parent | KVM/x86: Use assembly instruction mnemonics instead of .byte streams (diff) | |
| download | linux-dev-44c2d667ce3fa6933ac30a726f148f0c6d84ce5f.tar.xz linux-dev-44c2d667ce3fa6933ac30a726f148f0c6d84ce5f.zip | |
KVM/x86: Use 32bit xor to clear register
x86_64 zero-extends 32bit xor to a full 64bit register. Use %k asm
operand modifier to force 32bit register and save 268 bytes in kvm.o
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index c1b9bd15815c..0050fe81d857 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -61,7 +61,7 @@ #define __ex(x) __kvm_handle_fault_on_reboot(x) #define __ex_clear(x, reg) \ - ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg) + ____kvm_handle_fault_on_reboot(x, "xorl " reg " , " reg) MODULE_AUTHOR("Qumranet"); MODULE_LICENSE("GPL"); @@ -2312,7 +2312,7 @@ static __always_inline unsigned long __vmcs_readl(unsigned long field) { unsigned long value; - asm volatile (__ex_clear("vmread %1, %0", "%0") + asm volatile (__ex_clear("vmread %1, %0", "%k0") : "=r"(value) : "r"(field)); return value; } |